Illuminating unit



l 1,614 121 Jan' n 1927 c. A. a. HALvoRsoN, JR

ILLUHINATINQ UNIT Filed Jan. 25, 1924 l/ VERED o/v cans/05 Jf j W M ifmw M JM w mw f c@ Patented Jan. 1l, 1927.

uri-En STATES l,6l4,121 PATENT -FFice.

OROMWELL A.. B. HALvoRsON, JR., ORLYRN, rrliss'acntisnrrs,AssiGNOR 'roGENERL ELECTRIC COMPANY, A coRroRnfrIoN ORNRW YORK.

ILLUMINATING UNIT.

Application inea' January 25, i924. sei-iai' No. ese-,5er

My invention relates to lighting units. More particularly, it relates toan improved form of lighting unit especially adapted for industriallighting. l Y

I-Ieretofore, units for this purpose have been so constructed that theyeasily become coated with dust and dirt on the inside. Efforts have beenmade to produce dust-proof units, but the construction has always beenmore or less expensive.

Among the objects of my invention are the following: to provide a unitpractically dust-proof and especially adapted for interior lighting ofindustrial plants; to provide a uni-t so constructed that the variouselements may be easily replaced or removed and of such a constructionthat all the elements are easily accessible while maintaining a highefficiency in illumination; to provide a construction comparativelycheap to make; and to provid-e other details of improvement tending toincrease the eiciency and serviceability of a unit of this character.

The means for accomplishing the foregoing results are hereinafter morefully set forth and claimed, reference being had to the accompanyingdrawing which is a view in elevation and partly in section of the deviceof my invention.

In the construction as shown, I provide a holder 2, a hood 3, suitablypivoted to said holder. Around the neck of the hood, I provide a band 4which is clamped tO the hood and pivotally secured to the holder by thepin 17. The holder flares out in terrace fashion with three ledges. Tothe innermost ledge 5 is secured the electric lamp socket 6 through themedium of the screws 7. This socket of course receives the electric lamp8. The second ledge 9 is adapted to receive the reflector' 10. Thereflector 10 is clamped in position as indicated by means of suitableclamping screws 11. This reflector as is shown, is provided with anopening through which the neck of the lamp projects into the socket 6.As indicated in the drawing, the lamp is secured in the socket 6. Theneck of the lamp is sufliciently long to allow the lower or bulb portionto fall within the enclosure formed by the globe 3 and the reflector 10.It will be seen therefore that the reflector 10 and the bulb are bothenclosed by the hood 3 and the holder 2. The hood 3 has only one openingin the upper part the rim vof which is snugly pressed against the thirdledge' 14 of the holder. Preferably, af gasket is interposed between therim of the' dome and the ledge 1li. On the outside a l'atcliing' devicef8 is provided by means of which the' dome is latched in its closedposition. It will be seen therefore that the holder 2 and the hood 3 incombination form a closure which has only one opening. This opening isin the holder and into it the cable conduit 19 is shown projecting.Obviously, therefore, the unit is dust-proof, with the constructionshown, in order to remove the bulb 8, the hood 3 must be unlatched andallowed to fall back about the pivot 17 under the rim 16. By making thereflecting area of the reflector 10 as large as possible, that is, bymaking the opening through which the bulb projects as small as possible,I utilize the maximum amount of light which is reflected downward andwhich passes through the transparent lower surface 2O of the hood. Inthe construction shown, the sides of the hood 3 between the lower edgeof the reflector 10 and the lower face 20 is silvered on the outside.Therefore the sides of the dome are constructed as arefiector and all ofthe light produced by the unit passes downward through the lower sider20of the hood.

I wish to emphasize that my invention is not to be limited to thespecific structure shown in the drawing inasmuch as in view of thespecification and disclosure, other modifications will readily suggestthemselves to those versed in this art which will fall within the scopeof the claims appended hereto.

lhat I claim as new and desire to secure by Letters Patent of the UnitedStates, is,-

1. A dust-proof lighting unit comprising ahollow holder, an opening atone end ofthe holder', and al lamp socket secured inside the holder andserving to seal said opening, said holder having' a flaring mouth at theother end with a pair of offset ledges one larger v than the other, thelarger ledge being nearer th-e end and a globe secured to said largerledge serving to seal the mouth of the holder, the sides of the globebeing in the form of a reflector and the end of the globe being formedof light transmitting material whereby ,a beam of light is projectedthrough the end of the globe, and an auxiliary reflector secured to thesecond ledge and serving as a continuation of the reiiector sides of theglobe to increase the intensity of the beam, the whole forming a unitsubstantially sealed against dust.

2. A dust-proof lighting unit comprising a hollow holder, an opening atone end of the holder', and a lamp socket secured inside the holder andserving to seal said opening'7 said holder having a flaring mouth at theother end with a pair of offset ledges one larger than th-e other, thelarger ledge being nearer the end and a globe secured to said largerledge serving to seal the inouthl of the holder, the sides of the globebeing in t-he form of a reflector and the end of the globe being formedof light transmitting material whereby a beam of light is projectedthrough the end of the globe, and an auxiliary reflector secured to thesecond ledge and serving as a continuation of the reflector sides of theglobe to incr-ease the intensity of the beani, said globe being

